Pressure-operated switch



Oct. 21, 1930.

G. E. BODENHAMER PRES SURE OPERATED SWITCH Filed Jan. 31, 1927 wayw V reams ea. 2i. ieae @EQRGE E. BODENHAMER, F EBAY, CALIFORNIA ZRESS'URE-OPERATED SWITCH Application filed January 31, 1927.

This invention relates to an automatic pressure operated alarm primarily intended for use in connection with the oiling system of a motor operated vehicle, although its general application is contemplated by the claim, the invention contemplating certain improvements over my co-pending application. Serial No. 85,601.

In accordance with the present invention 1 if) comprehend the use of a curved thin resilient tube having a tendency to straighten itself under a predetermined pressure of fluid passing through the oiling system, and adapted to return to its normal position with a reduction of pressure, and thereby operate a circuit closer for the purpose of actuating a suitable signal, to indicate to the driver that the supply of oil should be replenished.

In accordance with the present invention 2 it is my purpose to connect the apparatus in circuit with the generator side of the vehicle. so that its utility is only called into use while the motor is in operation and the oil in'circulation.

The nature and advantages of the invention will be better understood when the following detail description is read in connec tion with the accompanying drawing, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawing forming part of this application like numerals of reference indicate similar parts in the several views and wherein:

Figure 1 is a view in elevation partly broken away showing the vibrator.

Figure 2 is a view taken at a right angle to Figure 1 and partly in section to show' the pressure operated circuit closer.

Figure 3 is a sectional view on line 3-3 of Figure 2.

Referring to the drawing in detail, 10 and 11 represent respective halves or sections of a suitable casing, provided with flanges which are bolted or otherwise suitably secured together as illustrated. Arranged within the section 10 is a vibrator which includes parallel arranged electromagnets 12 and 13 respectively, the poles thereof being connected by the element 14, while the armature 15 has as- Serial No. 164-,%S.

sociated therewith a resilient element 16 adapted to engage the contact 17 connected with the coils through the wire 18. The armature is mounted in any suitable manner and insulated as shown and is connected by means of a wire 19 with the stationary contact 20 of the pressure controlled circuit closer above referred to, and which will be hereinafter more fully described. The conductor leading from the generator, is indicated at 21, and current passes from the generator through the coils 12 and 13, and then through the wire 18 to the armature 15, through the medium of the resilient element 16 and contact 17. The current is then passed through the wire 19 to the contact 20 of the pressure controlled circuit closer to be now described. Y

The circuit closer is arranged within the section 11 of the casing, and includes a curved relatively thin resilient tube 22, one end of which opens into a bore 23 formed laterally in said casing and into which the branch pipe 24 is threaded, the branch pipe 21 extending from a pipe 25 adapted to be connected with an oil gauge at one end, and its other end connected with the duct through which the oil under pressure flows to the gauge. Consequently the tube 22 communicates with the branch pipe 24 and is supplied with pressure, under which circumstances the tube has a tendency to straighten out, and thereby hold the movable contact 26 spaced from the fixed contact 20 of the circuit closer. The contact 26 is carried by a curved arm 27 which is pivoted as at 28, and one end of this arm is connected with the adjacent end of the tube 22 by means of a pivoted link 29. A pin 27 is secured in the section 11 and acts as a stop for limiting the movement of the arm 27 in its direction away from the stationary contact 20. Therefore when the tube has a tendency to straighten out under the pressure within the same, the adjacent end of the arm 27 is slightly lifted, rocking the arm upon its pivot 28 and holding the contact 26 spaced from the contact 20. hen the pressure within the tube 22 is diminished an appreciable degree, the inherent qualities of the tube 22 causes the latter to resume its normal condition, thereby rocking the arm 27 in a reverse direction upon its pivot 28, and moving the contact 26 into engagement with the contact 20. The circuit is then completed through arm 27, link 29, oil tube 22 which is grounded, through ground, battery B, cut oii C, to generator, and thence to the coils which are energized to operate the armature and resilient element thereof to cause a buzzing sound so as to operate to direct the a tention of the driver to the fact that his oil supply needs to be replenished.

While it is believed that from the foregoing description, the nature and advantages of the invention will be readily apparent, I desire to have it understood, that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall Within the scope of what is claimed.

What I claim is: I

Circuit maker and breaker, a casing provided with a bore laterally arranged therein with one end of said bore in communication with a gage havin fluid under pressure, a curved relatively tliin resilient tube having one end opening into the bore for communica'- tion therewith, a curved arm pivotally and eccentrically secured adjacent one end in said casing, a pin in the path of the curved arm to limit its movement in the direction, 'a link having its ends pivoted to one 'end of said curved arm adjacent its pivotal connection and the adjacent end of said tube respectively, a contact carried by the opposite end of said curved arm, and a stationary contact arranged in said casing in the path of movement of thecontact carried by said arm.

In testimony whereof I affix 1n signature GEURGE BQDEN a R. 

